X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao106.cox.net ([68.230.241.40] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with ESMTP id 3766109 for flyrotary@lancaironline.net; Mon, 20 Jul 2009 14:29:21 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.40; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao106.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20090720182843.EWOQ25927.fed1rmmtao106.cox.net@fed1rmimpo03.cox.net> for ; Mon, 20 Jul 2009 14:28:43 -0400 Received: from BigAl ([72.192.133.78]) by fed1rmimpo03.cox.net with bizsmtp id JJUj1c0041hf1Cg04JUjmn; Mon, 20 Jul 2009 14:28:43 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.0 c=1 a=1joWGBoAs9XeINp6lmsA:9 a=HMkqx7kh9ipPAcr8e5TLk_JNkCEA:4 a=oHErA9Gc7PElSo0VJz4A:9 a=-LI9oRcxW6G6S2kRRVkA:7 a=9tv_nZfLmXButNOE5h63YvcdWAAA:4 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Alternator Filter Date: Mon, 20 Jul 2009 11:29:53 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01CA092D.66812B40" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6838 Importance: Normal Thread-Index: AcoJP2jXUoB6PiKhSduJ4ILv/lgMagAL/Kog In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01CA092D.66812B40 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Tuning is coming along pretty well on my newly running 20B. I have run = into a bit of a snag. Until last week I was running only on battery power, = then I brought my alternator on line. When the alternator is turned on, the engine starts to stumble and run rough. As soon as the alternator is = turned off it starts to run smoothly again. Any suggestions for alternator filtering? =20 Thanks, Joe =20 Joe; =20 You can try 100 mf capacitor between the alternator output and ground. =20 Do you notice any other parameters changing besides the voltage? And how much does the voltage change. =20 I have not found it necessary to filter the alternator output. If = anything, my engine runs smoother with alternator on. My conclusion is that I do = my tuning with it on; voltage about 14.5v. Running with it off and maybe = just under 12v changes the tuning a bit. =20 Al ------=_NextPart_000_0006_01CA092D.66812B40 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Tuning is coming along pretty well on my newly running 20B.  I have run = into a bit of a snag.  Until last week I was running only on battery = power, then I brought my alternator on line.  When the alternator is turned on, = the engine starts to stumble and run rough.  As soon as the alternator = is turned off it starts to run smoothly again.  Any suggestions for alternator filtering?

 

Thanks,

Joe

 

Joe;

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You can try = 100 mf capacitor between the alternator output and ground.  =

Do you notice = any other parameters changing besides the voltage? And how much does the = voltage change.

 <= /font>

I have not = found it necessary to filter the alternator output.  If anything, my engine = runs smoother with alternator on.  My conclusion is that I do my tuning = with it on; voltage about 14.5v. Running with it off and maybe just under 12v = changes the tuning a bit.

 <= /font>

Al

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